import React, { Component } from 'react'
import PropTypes from 'prop-types'
import {nanoid} from 'nanoid'


export default class Header extends Component {

  static propTypes = {
    addTodo:PropTypes.func.isRequired
  }

  handleKeyUp = (e)=>{
    const {keyCode,target} = e
    if(keyCode !== 13) return;
    if(target.value.trim() === ""){
      alert("输入不能为空")
      return
    }
    console.log(target.value);
    const todoObj = {
      id:nanoid(),
      name:target.value,
      done:false
    }
    this.props.addTodo(todoObj)
    target.value = ""
  }
  render() {
    return (
      <div className="todo-header">
        <input onKeyUp={this.handleKeyUp} type="text" placeholder="请输入你的任务名称，按回车键确认" />
      </div>
    )
  }
}
